Versions Compared

Old Version 1

changes.mady.by.user Kathy Maskell

Saved on

compared with

New Version 2

changes.mady.by.user Kathy Maskell

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

Table of Contents

Atmospheric general circulation component

 IFS cycle, 47r3

Table 1a: Key characteristics  of the atmospheric component of the ECMWF IFS (Based on the latest
 IFS cycle, 47r3)

 

Forecast / Analysis

Number of members

Horizontal resolution

Vertical levels

Pressure at model top (hPa)

Perturbation models

HRES

Atmospheric Model high resolution

Documentation

Forecast

  • 0–10 days

1

  •  Native (1): O1280 ~9km
  •  Interpolated (2): 0.1°  ~9km

137

0.01 hPa

No

ENS

Ensemble - Atmospheric Model

Documentation

Forecast

  • 0–15 days
51

Day 0-15

  • Native (1): O640 ~18km
  • Interpolated (2):0.2°
1370.01 hPa

Yes (4)

ENS Extended

Atmospheric Model Extended forecast (monthly)

  • Documentation

    • Forecast

    • 16–46 days
    • run twice a week
    		51
    • Native (1): O320 ~36km
    • Interpolated (2): 0.4°


    137

    		0.01 hPaYes (4)

    4DVAR

    4-Dimensional data assimilation

  • Documentation

    • Analysis

    1

    •  N255/N319/N399/N399 inner loop minimisations
    • 4 outer loops at O1280 resolution


    137


    		0.01 hPa

    No

    EDA

    Ensemble of data assimilations

    Analysis

    51

    •  N191/N191 inner loop minimisations
    • 2 outer loops at O640 resolution 

    137

    		0.01 hPa

    Yes (5)

    SEAS5 2017 version  Cycle 43r1

    Seasonal forecast

    Documentation

    Forecast

    • long-range forecast run monthly from 0 to 7 months
    • annual range forecast run quarterly from  0 to 13 months

    51


    15

    • Native (1):O320 ~36km
    • Interpolated (2): 0.4°

    91

    		0.01 hPa

    Yes (4)

    Ensemble and Seasonal re-forecasts

    Table 1b: Key characteristics of the ENS and SEAS re-forecasts of the ECMWF IFS

     

    Forecast/Analysis

    Number of members

    Horizontal resolution

    Vertical levels

    Pressure at model top (hPa)

    Perturbation models

    Number of years

    ENS

    • 0–46 days
    • run twice a week
    		11

    Day 0-15

    • Native (1): O640
    • Interpolated (2): 0.25° ~28km

    Day 16-46

    • Native (1): O320
    • Interpolated (2): 0.5° ~55km
    		1370.01 hPaYes (4)Most recent 20

    SEAS5  Cycle 43r1

    Seasonal forecast

    Forecast

    • run monthly
    • 0–7 months (monthly)


    • run quarterly 0-13 months (annual range)


    25


    15

    • Native (1):O320 ~36km
    • Interpolated (2): 0.4°

    91


    		0.01 hPaYes (4)36 (1981-2016)

    ...

    Ocean general and sea ice

    Table 1c: Key characteristics of the ocean component general circulation models of the ECMWF IFS

     

    Forecast/Analysis

    Number of members

    Horizontal resolution

    ORCA grid

    Vertical levels

    NEMO (LIM-2)

    Forecast

    • daily (HRES and ENS)
    • run monthly
    • 0–7 months (monthly)
    • run quarterly 0-13 months (annual range)

    51

    0.25°

    75

    Oceans

    • OCEANS-BRT (Behind Real-Time)
    • OCEANS-RT (Real-Time)

    Analysis

    Reanalysis

    5

    0.25°

    75

    ...

    Ocean-wave component

    Table 1d: Key characteristics of the ocean-wave component of the ECMWF IFS


    Forecast/Analysis

    Domain

    Number of members

    Horizontal resolution

    HRES-WAM

    Ocean Wave coupled to the atmospheric model

    Analysis and forecast

    • 0–10 days


    Global

    1

    • Native: 0.125° reduced (3) ~14km
    • Interpolated (2): 0.125°~ 14km

    ENS-WAM

    Ensemble wave forecast

    Forecast

    • 0-46 days

    Global

    51

    0-15 days

    • Native: 0.25° reduced (3)  ~28km
    • Interpolated (2): 0.25° ~28km

    16-46 days

    • Native: 0.5° reduced (3)  ~55km
    • Interpolated (2): 0.5° ~55km

    SEAS-WAM

    Seasonal wave forecast

    Forecast

    • run monthly
    • 0–7 months (monthly)
    • run quarterly 0-13 months (annual range)

    Global

    51

    • Native: 0.5° reduced (3)  ~55km
    • Interpolated (2): 0.5° ~55km

    ...

    Atmospheric and Ocean-wave reanalysis ERA5

    ERA5, based on IFS Cycle 41r2, is used to initialise ensemble reforecasts. 


    Forecast/Analysis

    Number of members

    Horizontal resolution

    Vertical levels

    Pressure at model top (hPa)

    Perturbation models

    ERA5 HRES

    Atmospheric high resolution reanalysis

    • Analysis
    • Forecast


    		1
    • ~ 31km, 0.28125 degrees (at the equator)
    • Depending on the parameter, the data are archived either as spectral coefficients with a triangular truncation of T639 or on a reduced Gaussian grid with a resolution of N320.
    		1370.01No

    ERA5 EDA

    Atmospheric reduced resolution ensemble

    • Analysis
    • Forecast
    		10
    • ~ 63km, 0.5625 degrees (at the equator)
    • Depending on the parameter, the data are archived either as spectral coefficients with a triangular truncation of T319 or as N160 reduced Gaussian grid.
    		1370.01Yes (5)

    ERA5 wave

    Ocean wave model (WAM) reanalysis

    • Analysis
    • Forecast
    		1

    0.36 degrees

    		1-No

    ERA5 wave EDA

    Ocean wave reduced resolution ensemble

    • Analysis
    • Forecast
    		101.0 degrees1-Yes (5)

     4D-Var data available for all the 4 entries.
     

    ...